How do the Z, N, and A values compare for each pair of atoms?
(a) ^3_1 H and ^3_2 He (b) ^14_6 C and ^15_7 N
(c) ^19_9 F and ^18_9 F

Answers

Answer 1

The Z value is the atomic number of an atom, which is the number of protons in the nucleus of an atom.

What is nucleus?

The nucleolus is a specialized structure located in the nucleus of a eukaryotic cell. It is composed of proteins and RNA molecules, and is responsible for the production, assembly, and transport of ribosomes. The nucleolus is the site of transcription, processing, and assembly of ribosomal RNA (rRNA) precursors into the ribosomal subunits that make up the ribosome. The ribosome is the cell's protein-synthesizing machinery, and the nucleolus is essential for its production. The ribosomes are then released into the cytoplasm, where they can translate mRNA into proteins.

The N value is the number of neutrons in the nucleus of an atom, and A is the mass number, which is the sum of the number of protons and neutrons in the nucleus of an atom.

For the first pair of atoms, ^3_1 H and ^3_2 He, the Z value for both is 3, since both have 3 protons in their nucleus. However, the N value for ^3_1 H is 1 and the N value for ^3_2 He is 2. Therefore, ^3_2 He has one more neutron in its nucleus than ^3_1 H. Lastly, the A value for ^3_1 H is 1 and the A value for ^3_2 He is 4. Therefore, the mass number of ^3_2 He is 3 times higher than ^3_1 H.

For the second pair of atoms, ^14_6 C and ^15_7 N, the Z value for both is 6, since both have 6 protons in their nucleus. The N value for ^14_6 C is 8 and the N value for ^15_7 N is 7. Therefore, ^15_7 N has one less neutron in its nucleus than ^14_6 C. Lastly, the A value for ^14_6 C is 14 and the A value for ^15_7 N is 15. Therefore, the mass number of ^15_7 N is 1 higher than ^14_6 C.

For the third pair of atoms, ^19_9 F and ^18_9 F, the Z value for both is 9, since both have 9 protons in their nucleus. The N value for ^19_9 F is 10 and the N value for ^18_9 F is 9. Therefore, ^18_9 F has one less neutron in its nucleus than ^19_9 F. Lastly, the A value for ^19_9 F is 19 and the A value for ^18_9 F is 18. Therefore, the mass number of ^18_9 F is 1 lower than ^19_9 F.

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Related Questions

how much energy must be released by 50.0 g of steam to decrease its temperature from 125.0 degrees Celsius to 100.0 degrees Celsius ?

Answers

Answer:

5250 Joules

Explanation:

Mass = 50g

Initial Temperature = 125.0 degrees Celsius

Final Temperature =  100 degrees Celsius

Temperature change = Final - Initial = 100 - 125 = -25

Heat = ?

These quantities are related by the equation;

H = mCΔT

where c = specific hear capacity = 4.2 J/g°C

H = 50 * 4.2 *  (-25)

H = -5250 J (The negative sign is because heat is being released)

What are the three types of plate boundaries? What is the direction of movement at each boundary?

Answers

There are three kinds of plate tectonic boundaries: divergent, convergent, and transform plate boundaries.

This image shows the three main types of plate boundaries: divergent, convergent, and transform.

This image shows the three main types of plate boundaries: divergent, convergent, and transform. Image courtesy of the U.S. Geological Survey. Download image (jpg, 76 KB).

The Earth’s lithosphere, which includes the crust and upper mantle, is made up of a series of pieces, or tectonic plates, that move slowly over time.

A divergent boundary occurs when two tectonic plates move away from each other. Along these boundaries, earthquakes are common and magma (molten rock) rises from the Earth’s mantle to the surface, solidifying to create new oceanic crust. The Mid-Atlantic Ridge and Pacific Ring of Fire are two examples of divergent plate boundaries.

When two plates come together, it is known as a convergent boundary. The impact of the colliding plates can cause the edges of one or both plates to buckle up into a mountain ranges or one of the plates may bend down into a deep seafloor trench. A chain of volcanoes often forms parallel to convergent plate boundaries and powerful earthquakes are common along these boundaries.

At convergent plate boundaries, oceanic crust is often forced down into the mantle where it begins to melt. Magma rises into and through the other plate, solidifying into granite, the rock that makes up the continents. Thus, at convergent boundaries, continental crust is created and oceanic crust is destroyed.

Two plates sliding past each other forms a transform plate boundary. One of the most famous transform plate boundaries occurs at the San Andreas fault zone, which extends underwater. Natural or human-made structures that cross a transform boundary are offset—split into pieces and carried in opposite directions. Rocks that line the boundary are pulverized as the plates grind along, creating a linear fault valley or undersea canyon. Earthquakes are common along these faults. In contrast to convergent and divergent boundaries, crust is cracked and broken at transform margins, but is not created or destroyed.

Which two statements about composite materials is true?

A. They're made up of more than one substance

B. They have the same or similar properties as the materials used to make them

C. They're always made of metal

D. They're readily available in nature

help as fast as u can please​

Answers

A and D are correct

How many atoms are in 12 moles of sodium?

Answers

Answer: There are 1.20 x 1024 atoms of sodium in 2 moles

Explanation:

If each water molecule contains 2 hydrogen atoms, how many total oxygen atoms in 20 water molecules?
10
20
40
60​

Answers

the answer is 10 because if their is 20 molecules of hydrogen then their is one oxygen molecule for each which results in 20 divided by two which equals 10

2. How does an atom become an Ion

Answers

Answer: An atom becomes an Ion if it gains one or more electron(s) or if it loses one or more electron(s).

There are two isotopes of an unknown element, X-19 and X-21. The abundance of X-19 is 14.55%. A weighted average uses the percentages of each isotope to scale their contribution to the total mass. Each isotope's contribution is the percentage (in decimal form) multiplied by the mass of the isotope. What is the contribution (in amu) to the weighted average from the X-19 isotope, which has a mass of 19.00 amu

Answers

Answer:

2.765amu is the contribution of the X-19 isotope to the weighted average

Explanation:

The average molar mass is defined as the sum of the molar mass of each isotope times its abundance. For the unknown element X that has 2 isotopes the weighted average is defined as:

X = Mass X-19 * Abundance X-19 + MassX-21 * Abundance X-21

The contribution of the X-19 isotope is its mass (19.00 amu) times its abundance (14.55% = 0.1455). That is:

19.00amu * 0.1455 =

2.765amu is the contribution of the X-19 isotope to the weighted average

Mass of hydrated copper sulfate in CuSo4.5H2O​

Answers

Answer: Molar mass of [tex]CuSO_4.5H_2O[/tex] is 249.68 g/mol.

Explanation:

Molar mass is the mass of 1 mole of the molecule. It is calculated by adding masses of all the atoms in the given molecule.

[tex]CuSO_4.5H_2O[/tex] contains one atom of copper , 1 atom of sulphur, 9 atoms of oxygen and 10 atoms of hydrogen

Mass of copper = 63.5  g/mol

Mass of sulphur =  32.06 g/mol

mass of oxygen = 16.00 g/mol

Mass of hydrogen = 1.008 g/mol

 Thus mass of [tex]CuSO_4.5H_2O[/tex] = 63.5(1)+32.06(1)+16.00(9)+1.008(10)=249.68 g

Molar mass of [tex]CuSO_4.5H_2O[/tex] is 249.68 g/mol.

How many molecules are there in 10.5 grams of iron (111) sulfate trihydrate? With work shown

Answers

Fe2(SO4)3.3H2O = 56*2 + 3*(32+16*4)+3*(1*2+16) = 454 g/mol
Mol =m/M = 10.5/454 = 0.023 mol
Can u mark it brainliest ?

Diffusion of Sucrose in Gelatin. A layer of gelatin in water 5 mm thick and con-taining 5.1 wt % gelatin at 293 K separates two solutions of sucrose. The concentra-tion of sucrose in the solution at one surface of the gelatin is constant at 2.0 g sucrose/100 mL solution, and 0.2 g/100 mL at the other surface. Calculate the flux of sucrose in kg sucrose/s

Answers

Answer:

the flux of sucrose is 9.072 × 10⁻⁷  kg sucrose / m² sec

Explanation:

Given the data in the question;

water-gelatin solution separating two different concentration solutions of sucrose; 5.1 wt % gelatin at 293 K; at this conditions diffusivity of sucrose in water gelatin solution is;

[tex]D_{AB}[/tex] =  0.252 × 10⁻⁹ m²/sec.

we know that; 1 L = 0.001 m³, 1mL = 0.001 L

[tex]C_{A1}[/tex] = 2.0 g sucrose/100 mL = 2.0 × 10⁻³ kg sucrose / 100 × 10 ⁻³ L

[tex]C_{A1}[/tex]  = 2.0kg sucrose / 100 L

[tex]C_{A1}[/tex] = 2.0 kg sucrose / 100 × 10⁻³ m³

[tex]C_{A1}[/tex]  =  20 kg sucrose / m³

[tex]C_{A2}[/tex] =  0.2 g sucrose/100 mL = 0.2 × 10⁻³ kg sucrose / 100 × 10⁻³ × 10⁻³ L

[tex]C_{A2}[/tex] = 2 kg sucrose / m³

Thickness ß = 5 mm = 5 × 10⁻³ m

Now, flux of sucrose in kg sucrose / m³sec will be;

using the formula, [tex]N_{A}[/tex] = [tex]D_{AB}[/tex] /ß ( [tex]C_{A1}[/tex] - [tex]C_{A2}[/tex] )

we substitute

[tex]N_{A}[/tex] = (0.252 × 10⁻⁹ m²/sec /  5 × 10⁻³ m) ( 20 kg sucrose / m³ - 2 kg sucrose / m³ )

[tex]N_{A}[/tex] = (0.252 × 10⁻⁶ / 5) × 18 kg sucrose / m² sec

[tex]N_{A}[/tex]  = 4.536 ×  10⁻⁶  / 5 kg sucrose / m² sec

[tex]N_{A}[/tex] = 9.072 × 10⁻⁷  kg sucrose / m² sec

Therefore, the flux of sucrose is 9.072 × 10⁻⁷  kg sucrose / m² sec

The reaction for luminol is basically luminol and hydrogen peroxide. In the instructions for the preparation of the chemicals, I found that the hydrogen peroxide is 44 times more concentrated than the luminol. The fact that there are two reactants, should make you wonder if the reaction is second order overall. However, in class, we presented data that showed that the natural log of the amount of light change over time was a straight line with a negative slope. This would tend to make you think that the reaction is first order, given the information here, you can confidently say that this reaction is:
A. zeroth order
B. first order
C. pseudo first order
D. second order
E. third order

Answers

Answer:

pseudo first order

Explanation:

We know that for a first order reaction, the plot of the natural log of the amount of reactant against time is a straight line with a negative slope. In this case the amount of substance is monitored using the amount of light change. Hence, the plot of the natural log of the amount of light change against time was a straight line with a negative slope.

The statement above characterizes a first order reaction. However, we must remember that the reaction is bimolecular; it involves luminol and hydrogen peroxide. The hydrogen peroxide is 44 times more concentrated than the luminol making the reaction a pseudo first order reaction.

A Pseudo first-order reaction can be defined as a second-order or bimolecular reaction that is made to behave like a first-order reaction(Byjus).

What is an extinct species? *
(10 Points)
O A. a species that blends in easily with its environment
O B. a species that resembles another species
O C. a species that was unable to adapt and died out
O D. a species that is bred for specific characteristics

Answers

Answer: C

Explanation: I got it right.

PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP

DUE IN 5 MINUTES CHEMISTRY DIMENSIONAL ANALYSIS

In 2009, Usain Bolt ran 100 meters in 9.58 seconds. What is this speed in km/hr? (!! DIMENSIONAL ANALYSIS!! NOT A REGULAR PROBLEM)

Answers

100 m = 0.1 km
9.58 sec = 9.58/3600 = 0.00266 hr
Speed = 0.1/0.00266= 37.6 km/hr
Can you mark it brainliest?

what causes the different crusts to rise and lower?

Answers

Answer:

tectonic plates

Explanation:

The hot mantle below the crust and its high pressure on the crusts. It also created volcanoes. The hot mantle rises then sinks back down cause if the mantle rise due to heat, then it will fall due to cooling.

_______________ is the interaction between organisms in an ecosystem.​

Answers

Mutualism, commensalism, competition, and predation. I’m not sure if those are correct sorry.

SUMMARY: Write a 3-4 sentence summary about the Periodic Table.

Answers

Answer:

The periodic table, also known as the periodic table of elements, is a tabular display of the chemical elements, which are arranged by atomic number, electron setup, and repeating chemical properties. The structure of the table shows occasional (popular things/general ways things are going). The seven rows of the table, called periods, generally have metals on the left and nonmetals on the right. The columns, called groups, contain elements with almost the same chemical behaviours. Six groups have accepted names as well as assigned numbers: for example, group 17 elements are the halogens; and group 18 are the noble gases. Also displayed are four simple rectangular areas or blocks connected with the filling of different atomic orbitals.

Explanation:

i think that's what you're looking for...

Compare land cover and land use, explaining how they are related and describing one way that humans can affect that relationship.

Answers

Answer:

Land covers refer to all the manufactured structures and vegetation that covers the land it includes all vegetation including plants, shrubs, trees, and other man-made structures too.

On other hand, Land use is the term that explains the use of the land by the different human activities that are occurred on land that are directly related to the land.

Land cover influences land use by utilizing particular land such as parks, ponds, or other uses according to the land. and humans can cause changes in both when they urbanize the area or land.

Is nitric acid a strong or weak acid. Explain your answer.

Answers

Answer:

There are only a few (7) strong acids, so many people choose to memorize them. All the other acids are weak. The strong acids are hydrochloric acid, nitric acid, sulfuric acid, hydrobromic acid, hydroiodic acid, perchloric acid, and chloric acid.

Explanation:

그것은 당신의 교육에 도움이 되기를 바랍니다

Convert Fahrenheit temperature
to Kelvin scales​

Answers

°C + 273.15 = K. The basic formula for converting Fahrenheit into Celsius is (°F − 32) × 5/9 = °C. To convert Fahrenheit degrees into Kelvins, (°F − 32) × 5/9 + 273.15 = K.

Answer:

K = (F – 32)5/9 + 273.15

Explanation:

You basically convert Fahrenheit to Celcius and then to Kelvin

Here's the entire formula:

K = (x °F – 32)5/9 + 273.15

How to make 0.01 Molar solution in 30 ml of water

Answers

Answer:

You see the concentration decreased ten fold, from 1 M to 0.1 M.

You can simply increase the volume by ten times.

For example

If you have 250 mL of 1 molar HCl, you can add distilled water upto 2500 mL. Now the concentration is 0.1 molar.

If you want to use the serial dilution method, you can use the C1V1=C2V2 equation.

C1 = starting concentration.

C2 = final concentration.

V is for volume.

So let's say you have 500 mL of 1 M HCl and you only want 50 mL of 0.1 M HCl.

1 M x V1 = 0.1 M x 50 mL

V1 = 5 mL

So you take 5 mL of the original (stock) solution and dilute it up to 50 mL. Then you have 50 mL of 0.1 M HCl.

Explanation:

Which substance is one that cannot be separated or broken down into simpler substances by chemical means? (Element, pure)

table salt (NaCl)
gold wire (Au)
candle wax (CH2O)
water vapor (H2O)

Answers

Answer:

gold wire (Au)

Explanation:

A substance that cannot be separated or broken down into simpler substances by chemical means is an element.

Between the given options only gold wire is an element, Au.

A way of knowing that it is an element is noticing that its formula is a single symbol which corresponds to an element found in the periodic table, unlike a combination of said symbols (like NaCl or H₂O).

an alloy is a metal that has?

Answers

An alloy always has two or more elements/metals in it. An alloy always has at least metal in it.

Steels have iron and carbon in it. Bronze is copper and tin, or aluminum, or manganese, or zinc. German silver isn't silver at all and contains copper, zinc, and nickel.

Hope this helps!

if an atom has 22 protons 28 neutrons 20 electrons what would its atomic number be

Answers

Answer:

22

Explanation:

The atomic number indicates the amount of protons, so it would be 22

Which is correct order of the weather observed with each cloud type from 1 to 4?


A. Rain, thunderstorm, snow, fair

B. Light rain, fair, thunderstorm, fair

C. Light rain, thunderstorm, fair, fair

D. Hail, lightning, thunderstorm, fair

Answers

Answer:i thinks its A

Explanation:but who knows

A food company produces raspberry coulis as a topping for its best-selling line, double strength chocolate mousse pie. Fresh raspberries comprising 5% seeds, 20% pulp solids, and 75% water are homogenised and placed in a stainless steel vat. Sugar is added to give a raspberry:sugar mass ratio of 3.5:1. The mixture is blended, strained to remove the seeds, then heated to reduce the water content to 35%. Half a tonne of coulis is produced every day.

Required:
a. What mass of raspberries is required per week?
b. How much sugar is required per week?
c. What is the sugar content of the coulis?

Answers

Answer:

5357.1429kg per week

2142.8571 kg per week

Explanation:

Given that :

Fresh Raspberries :

5% = seeds

20% = pulp solids

75% = water

Raspberry : Sugar = 3.5 : 1

Water content = 35%

Coulis produced per day = 0.5 tonnes

Mass of Raspberry produced per week :

Mass is measured in kg;

1 tonne = 1000kg

0.5 tonne = (1000/2) kg = 500kg

Mass of Coulis produced per week = 500kg * 7 = 3500kg

Coulis contains 35% water, Raspberry required 75% water :

(3500 / 35) * 75 = 7500kg

Raspberry : Sugar ratio = 3.5 : 1

Mass of Raspberry :

[7500 - (1 /3.5) * 7500]

7500 - 2142.8571

= 5357.1429kg per week

B.

Sugar required per week:

(1/3.5) * 7500kg

= 2142.8571 kg per week

C.)

Sugar content in coulis :

The foam football Coach Johnson left in his chair will stay there until he
moves it to sit in the chair.


A. Newton’s first law
B. Newton’s second law
C. Newton’s third law

Answers

Answer:

B. Newton’s second law

Explanation:

correct me if im wrong

Answer:

Its c newton third law

Explanation:

His third law states that for every action (force) in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal and opposite force on object A. Notice that the forces are exerted on different objects.

A flask at room temperature contains exactly equal amounts (in moles) of nitrogen and xenon.

a. Which of the two gases exerts the greater partial pressure?
b. The molecules or atoms of which gas have the greater average velocity?
c. The molecules of which gas have the greater average kinetic energy?
d . If a small hole were opened in the flask, which gas effuses more quickly?

Answers

Answer:

a) Same

b) Nitrogen

c) Same

d) Nitrogen

Explanation:

a)

The formula for partial pressure of a gas is equal to

[tex]p_B = n_B \frac{RT}{V}[/tex]

Here nB is the number of moles .

The number of moles for both the gases are same and hence the partial pressure for the two gases will also be same.

b) The greater average velocity is calculated by using following formula

[tex]v_{RMS} = \sqrt{3RTM}[/tex]

Here M is the molar mass.

Molar mass of nitrogen is greater than the molar mass of xenon and hence nitrogen will have higher greater average velocity

c) As we know, the average kinetic energy of gas particles is dependent on the absolute temperature of gas and if all the gases are at same temperature, their kinetic energy will also be same. Since nitrogen and xenon are at same temperature, their kinetic energy will be same

d) Effusivity is depended directly on  the thermal conductivity,  density and  and the specific heat capacity.

All these three parameters are higher in case of nitrogen. Thus, it will effuse first

What element does Ca-37 turn into when it gives off radiation?
K-37
K-39
Sc-37
Sc-45

Answers

Ca-37 decays by positron emission (beta plus decay) to form K-37.

In this type of decay, a proton is converted into a neutron, giving off a positron (an antielectron) in the process. In essence, the atomic number of the element is reduced by one. The element with the atomic number of Ca minus one is potassium (K); the mass number remains unchanged (37) since it is the sum of the protons and neutrons in the nucleus, which is the same before and after decay (a proton became a neutron, and the positron isn’t a nucleon).

Give the coefficient of y in the following expression. 2xz² - 7xy + 4.​

Answers

Answer:

the coefficient of y is -7

Answer please I need help

Answers

Answer:

Explanation::::

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In this excerpt from The Red Shoes by Hans Christian Anderson, who are the two minor characters?There was once a pretty, delicate little girl, who was so poor that she had to go barefoot in summer and wear coarse wooden shoes in winter, which made her little instep quite red.In the center of the village there lived an old shoemaker's wife. One day this good woman made, as well as she could, a little pair of shoes out of some strips of old red cloth. The shoes were clumsy enough, to be sure, but they fitted the little girl tolerably well, and anyway the woman's intention was kind. The little girl's name was Karen.On the very day that Karen received the shoes, her mother was to be buried. They were not at all suitable for mourning, but she had no others, so she put them on her little bare feet and followed the poor plain coffin to its last resting place.Just at that time a large, old-fashioned carriage happened to pass by, and the old lady who sat in it saw the little girl and pitied her."Give me the little girl," she said to the clergyman, "and I will take care of her."KarenKarens motherthe shoemakers wifethe old ladythe clergyman Could somebody PLEASE help ASAP! I will mark brainliest!2x + 11 = 39Please solve for x Science Mysteries: How Many Species Are There?You might think that after 200 years, the scientists who find, name, and describe Earth's species would be close to finished. But taxonomists, as organized as they may be, have no idea how many species Earth has. Nor can they even provide an educated guess. Although reporting over 16,000 new species every year, taxonomists still cannot predict how many more are undiscovered.In total, taxonomists have categorized and listed 1.2 million species on Earth. At this point, you would think scientists should be able to use the information they have gathered to make good predictions about how many species an ecosystem can support. This would help them make better predictions about how many species are left to identify. So far, however, the guesses seem to vary so greatly that it seems there is no good theory for making a prediction.One of the main problems is that most of the places that seem to have a lot of diverse species are in places that are hard to get to. One such place is the ocean, where scientists believe some 80 percent of Earth's creatures are hiding at depths too deep for us to study. In addition, many of the planet's most diverse areas are in remote places with few taxonomists. Despite all the unknowns, scientists have agreed that there are between five and 15 million species left to discover on Earth. This is a huge range, but whether it's five or 15, taxonomists clearly still have a lot of work to do. And who knows, there may yet be a dragon or a Loch Ness monster left to discover.Which word from the third paragraph best describes the problem facing taxonomists? Diverse Ocean Creatures Remote PLLZZZZZZ HELPPEst-ce que tu (jouer)du piano? Hide hint for Question 3jouer is a regular -er verb conjugate for tu 20 points!! will mark Brainliest if correct!!plz help I need this done today!! Paraphrasing is the ________________of written information into a new piece of writingtellingrewordingrecallingcopying There are 120 counters in a bag.40% of the counters are red.3/8 of the counters are yellow.The rest of the counters are green.Find what fraction of the counters are green. 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